Process for rolling thin or middle sheets from sheet bars



March 22,1927.

G. BOSCARELLI PROCESS FOR ROLLING THIN OR MIDDLE SHEETS FROM SHEET BARS Filed June 20, 1923 3 Sheets-Sheet 1 A B C D E I //v VE/VTOR.

1343M MQMYM March 22, 1927.

G. BOSCARELLI 5 FOR ROLLING THIN OR MTbDLE SHEETS FROM SHEET BARS PROCES Filed June 201 1923 3 Sheets-Sheet 2 I 1,622,177 March 1927' G. BoscARELl- PROCESS FOR ROLLING THIN OR MIDDLE SHEETS FROM SHEET BARS Filed June 20, 1923 3 Sheets-Sheet 5 Patented 22, 1927.

UNITED STATES PATENT OFFICE.-

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Application filed June 80, 1988, Serial No.

before the-superimposed sheets are doubled,

' rolls while the roller is passing imposed and in as' necessary in the sheet rolling process now employed.

1n the process hitherto in .use, two sheet bars only are mani' ulated at the same time by two operators w 0 er takes the first of a pair of sheet bars and asses it through the rolls to the catc er 'who receives .the rolled sheet with a pair of, tongs and holds it above the the second sheet bar through the rolls. 'lhe roller then takes the first sheet bar from the catcher who then receives the second sheet bar with his tongs and holds it in Iposition for-the roller 'to take it after e has again the first sheet bar through the ro After the pair of sheet bars have been passed through the rolls for a sufficient num er of timesthey are superthis form passed through the rolls again until they are too cold to be extended and reduced in thickness by rolling. They are then placed in the furnace to be reheated while asecond pair of sheet bars are passed through the rolls in the same manner. When this second air of sheet barsflhave been rolled out to t e same dimensions as the first pair, one of these sheet bars is suiperimposed' on ,the sheet formed from the being reheated in the furnace and when sufficiently hot the three superimposed sheets are again passed through the rolls a suflicient number of times to obtain a combined or three leaf sheet of such dimensions as to allow ofits'be' doubled when the com-. bined sheet is again reheated in the furnace and again passed through the rolls in doubled form until it is finally reduced to the desired dimensions.

According to the present invention three or more sheet bars are manipulated simultaneously in such a manner that the intermediate heating now necessary when the first pair of sheet bars have been superimposed and are cold and'the'secondpair of sheet bars are being. assed through the 0 seerolls, is done away wi and also are usually known as the roller and the catcher. The a rollrst pair of bars which are 848,888, and in Great Britain July 21, 1922.

ond rolling process now necessary when the sheets are superimposed, to obtain the desired dimensions for doubling. The method of carrying out my process 13 shown by way of. example in the accompanying drawings in whic Figures 1 to-3 show diagrammatically the method of carrying out the process.

Referring now to Figure 1, which illustrates more particularly the method carried out for three sheet bars. The sheets are numbered 1, 2 and 3 the res tive numbers referring to the same sheet in" each diagram forming Figure 1. sheet 1 through it is taken by the catcher and raised by him over the upper roll, as at B,'while the roller passes sheet 2 through the rolls. The roller then takes sheet 1 fromthe catcher and places it behindsheet 3 while the catcher takes sheet 2 as at O. The roller passes sheet 3 through the rolls while the u per roll as at D. The roller then takes s eet- 2 from the catcher ;and places it behind sheet 1 while the catcher is taking sheet 3 as at E. Sheet 3 is raised by the catcher while the roller sheet 1 through the rolls once more as at F, and takes sheet 3 from the catcher and places it behind sheet 2, while the catcher takes'sheet 1 as at G. The three bars are passed throu h the rolls in order, in this manner a su cient number of'times to obtain the desired dimension, when they are The roller passes the roll's as at A, where catcher raises sheet 2 over the passes superimposed by the roller on receiving them from the catcher over the up .r roll as at H and then assed toget er through the rolls in this co ined leaf form, still without further heating, until rolled to the desired dimension when they are doubled and reheated in the usual manner, before the sheet composed of six superimposed leaves thus formed by doubling the three leaf sheet is passed through the rolls again method carried out for four sheet bars. The

sheets are numbered 1, 2, 3 and 4, the respective numbers referring to the same sheet in each diagram forming Figure 2. .The 'roller commences with four sheets conmoves sheet 3 in the rolls.

gether wit groups, one behind the other as at A. He

passes sheets 1 and 2 consecutively through the rolls as at B and C, the catcher taking sheets 1 and 2 together as the roller The catcher then raises sheets 1 and 2 while sheets 3 and 4 are being passed through the rolls as at D.

They are then taken by the roller overthe upper roll as soon as sheet 4 has passed through the rolls, as at E. Thecatcher commences to raise sheets 3 and 4 while sheet 2 is passing through the rolls as at F and has completely raised them over the upper roll when sheets 1 and 2 have both been passed through the rolls as at G. This process is continued, the bars passing singly through the rolls till the desired dimensions are obtained the whole four then being piled by the catcher as at H and J and then passed back as a group over the upper roll as at J. They are then rolled together without the necessityof heating as at K until the desired dimensions for doubling and reheating are breached.

It will be seen that by this method, though the sheets-are rolled singly they are lifted and lowered in pairs, so that the catcher has the time to lift the pair while the other pair are passing consecutively through the rolls, that'is approximate y twicethe time allowed in the method of rolling two sheets at present used, the only special precaution necessary being that the catcher must commence t e lift as soon as possible to clear the guides for the reception of the next sheet.

Referring now to Figure 3, this shows my method carried out for six sheet bars. ,The sheets are numbered 1, 2, 3, 4, 5 and 6, the respective numbers referring to the same sheet in each diagram forming Figure 3. The roller commences with the six sheets conveniently and preferably arranged in two groups of three, one behind the other as at A. He passes sheets 1, 2 and 3 in succession through the rolls as at B, C and D and they are taken by the catcher who commences to raise them together as sheet 4 comes through the rolls, as at E The catcher continues to raise the three sheets until he has lifted them over the upper roll where they are taken by the roller when the three sheets 4, 5 and 6 have passed through the rolls as at C. The catcher then lifts sheets 4, 5 and 6 together during the time that sheets 1, 2 and 3 are again passed consecutively through the rolls as at H, J, K and L. The process is repeated a sufli'rient number of times and'when the sheets have been rolled singly in the desired dimensions, the whole six are piled by the catcher as at H and N, passed back to the roller over the upper roll as at C and rolled toout the necessity ofreheating,

doubling and reheating are-reached. It will be seen that by this method, though the 7 sheets are rolled singl they are lifted and lowered in threes, so tli the time to lift the three sheets together while the other three are passing consecutively through the rolls, that is approximately three times the time allowed in the method of rolling two sheets at present used, the only special precaution necessary being that the catcher must commence the lift as soon as possible 'to clear the guides for the reception of the next sheet.

In both of the two latter systems described above, not only is the length for doubling acquired without the necessity for reheating the roughed out sheets, but it is proved in working that production is greatly increased, as four or six sheet bars, instead at the catcher has six sheet bars to the length for doubling is approximately the same as that taken to extend onl two sheet bars to the shorter length 0 singled out sheets, by the method at present in use. The reheating operations and all the necessary and costly operations in connection with this, are completely eliminated, the first heating applied to the sheet bars being fully utilized.

The four sheet bar method is used preferabl to roll sheets of standard gauges lower than No. 30 (3 mm. or more in thickness). Sheets of gauges between No. 30 and No, 36 are more easily rolled by the six sheet bar method.

Although the methods above described are adapted to 'be successfully carried out entirely by hand, I prefer to provide a mechanical device for lifting the groups of sheets on the catcher side of the rolls.

It will be obvious that the lifting bars 3 must be made long enough to clear the greatest length the sheets attain during the roughing out process when they are rolled consecutively. When the groups are rolled together to the length for doubling, they may extend beyond the lifting rods 3 onto the frame 1, so there will be no sheets to clear on the descendin stroke the whole number of sheets being owered by the roller on his side of the rolls, while the frame is descending on the catchers side.

What I claim is 1. A method for producing middle or thin sheets from sheet bars. in which the necessity for intermediate heating is avoided and the time for production reduced, comprising the rolling consecutively of a plurality of sheet bars to the desired dimensions, piling them together and rolling again in this combined thus formed and finally rolling the said com-- combined form to the desired dimensions,

superimposing said pairs and rolling again in the combined form, doubling the said combined sheet and then reheating the doubled sheet thus formed and finally rolling the saiddoubled sheet to the desired dimen- SIOIIS.

3. A method for producing middle or thin sheets from sheet bars in whlch the neccssi for intermediate heating is avoided and the time for production reduced, comprising the rolling consecutively of a plurality of sheet bars to the desired dimension, pii together and rolling again in this leaf form to the desired dimensions without further heating, mechanically lifting the combined sheet on the catcher side ofvthe ty and rolling again in ng them, combined I rolls, in orderthat they may be passed over the rolls to doubling and. heating means, doubling the saidcombined sheet and then reheating the doubledsheet thus formed and finally rolling the said, combined doubled sheet to the desired dimensions.

4. A method for producing middle or thin sheets from sheet bars, in which the necessity for intermediate heating is avoided and the time for production reduced, comprising rolling consecutively four sheet bars to the desired dimensions, piling said sheet bars in pairs and rolling again in this combined form. to the desired dimensions. mechanically lifting the groups of sheet bars on the catcher side of the rolls, in order that they may be passed over the rolls to doubling and heating means, superimposing said pairs the combined form, doubling the said combined sheet and then reheating the doubled sheet thus formed and finally rolling the said combined doubled sheet to the desired dimensions.

In testimony whereof I have signed my name to this specification.

GIOVANNI BOSCARELLI. 

